Hammer drill



FIG. 1 is a perspective view of a hammer drill embodying our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings represent the portions of the airless spray gun that form no part of the claimed design. 

CLAIM The ornamental design for a hammer drill, as shown and described. 